Evaluation of fitness level by the oxygen uptake efficiency slope after a short-term intermittent endurance training (original) (raw)
Related papers
Nagoya journal of medical science
We investigated the usefulness of the oxygen intake efficiency slope (OIES) as a submaxima! measure of cardiorespiratory functional reserve. OIES was derived from the relationship between oxygen consumption (V0 2 ; mllmin) and minute ventilation (VE; lImin) during incremental exercise, which was determined by the following equation: V0 2 = a 10gVE + b, where "a" represents OIES, which shows the effectiveness of ventilation. Maximal oxygen consumption (V0 2 max) is effort-dependent. There is no standard submaxima! measurement of cardiorespiratory reserve that provides generally acceptable results. Exercise tests were performed by 17 normal volunteers on an ergometer using a symptom-limited Ramp protocol. Expired gas was continuously analyzed. OIES was calculated using the first 75%, 90% and 100% of exercise data. We also determined the following submaximal parameters: the ventilatory anaerobic threshold (VAT), the slope of the minute ventilation-carbon dioxide production relationship (VE-VC0 2 slope), and the extrapolated maximal oxygen consumption (EMOC). We analyzed the relationship between OIES, other submaximal parameters and V0 2 max, and examined the effects of submaximal exercise on OIES. The correlation coefficient of the logarithmic curve-fitting model was 0.991 ± 0.006. OIES and V0 2 max were significantly correlated (r = 0.966, p < 0.0001). The correlation between OIES and V0 2 max was stronger than the correlation between V0 2 max and VAT, the VE-VC0 2 slope and EMOC. OIES values for 100% and 90% of exercise were identical; OIES for 75% of exercise was slightly lower (3%). Our results suggested that OIES may provide an objective, effort-independent estimation of cardiorespiratory functional reserve.
Pulmonary and Critical Care Medicine, 2017
Objective: The purpose of this study was to investigate if the OUES is determined by the same factors when calculated with VO 2 and VE values throughout the incremental test (OUES 100) or using values until 80% of the VO 2 max (OUES 80). Methods: 116 healthy male individuals performed a maximal incremental test, two constant-speed tests and a maximal dynamic strength test. Results: OUES 100 and OUES 80 were significantly correlated (r = 0.964; P < 0.001). VO 2 max was the main determinant factor for both OUES 100 and OUES 80. Additionally, maximal heart rate (HRmax) and maximal dynamic strength (1RM) were the other variables selected for the two models as secondary variables. However, the importances of them were inversed, with the HRmax being the second determinant of the OUES 80 , while 1RM the second determinant for OUES 100. The running economy, ventilatory threshold and respiratory compensation point were not selected for the models (P > 0.05). Conclusions: Our results suggest that the OUES 80 might satisfactorily replace maximal variables in aerobic fitness evaluations without maximal effort requirement. VO 2 max seems to be the main factor determining oxygen uptake efficiency slope, regardless the range (maximal or submaximal) used to determine. Otherwise, the muscle strength plays a more important role to the oxygen uptake efficiency considering maximal intensities, while the cardiovascular system seems to more strongly influence the oxygen uptake efficiency only until submaximal intensities.
BMC Research Notes, 2012
Background: The purpose of this study was to reveal any association between cardiorespiratory fitness level and excess post-exercise oxygen consumption (EPOC) using three cycling protocols with varying degrees of exercise intensity, i.e., sprint interval training (SIT), high-intensity interval aerobic training (HIAT), and continuous aerobic training (CAT). Findings: Ten healthy men, aged 20 to 31 years, attended a cross-over experiment and completed three exercise sessions: SIT consisting of 7 sets of 30-s cycling at 120% VO 2max with a 15-s rest between sets; HIAT consisting of 3 sets of 3-min cycling at 80~90% VO 2max with a 2-min active rest at 50% VO 2max between sets; and CAT consisting of 40 min of cycling at 60~65% VO 2max . During each session, resting VO 2 , exercise VO 2 , and a 180-min post-exercise VO 2 were measured. The net exercise VO 2 during the SIT, HIAT, and CAT averaged 14.7 ± 1.5, 31.8 ± 4.1, and 71.1 ± 10.0 L, and the EPOCs averaged 6.8 ± 4.0, 4.5 ± 3.3, and 2.9 ± 2.8 L, respectively. The EPOC with SIT was greater than with CAT (P < 0.01) and HIAT (P = 0.12). Correlation coefficients obtained between subjects' VO 2max and the ratio of EPOC to net exercise VO 2 for SIT, HIAT, and CAT were −0.61 (P = 0.06), -0.79 (P < 0.01), and −0.42 (P = 0.23), respectively. Conclusions: Our data suggest that cardiorespiratory fitness level correlates negatively with the magnitude of EPOC, especially when performing aerobic-type interval training.
Brazilian Journal of Physical Therapy, 2019
Background: Cardiopulmonary exercise testing is the main tool assessing cardiorespiratory fitness. However, cardiopulmonary exercise testing devices are expensive and often cannot be used. Objective: The present study sought to develop cardiopulmonary exercise testing equations for estimating maximum oxygen uptake from ergometric testing combined with ventilometry. Methods: 181 volunteers of both sexes were submitted to cardiopulmonary exercise testing on treadmill using an incremental protocol. Volunteers were randomized into two groups: regression group: composed of 68 women with age 24.7±6.0 years and 54 men aged 21.5±3.9 years; and a cross-validation group composed of 29 women with mean age of 23.8±4.7 years and 30 men with a mean age of 23.1±4.4 years. The estimating equations were developed using multiple stepwise linear regressions; comparison of means was done using a t test and reliability assessed by Cronbach's alpha. Results: 8 independent variables exhibited a significant result for estimating VO 2max : minute ventilation (E) at second ventilatory threshold (VT-II): (E VT-II); heart rate at VT-II (HR VT-II); body mass (BM); body mass index (BMI); fat percentage (F%); age; sex; velocity at VT-II (Vel VT-II); test time of VT-II (T VT-II) and final test velocity (Vel final). Two equations presented more
ISRN Physiology, 2013
Body mass index (BMI) is negatively correlated with cardiorespiratory fitness, measured by maximal or peak oxygen consumption (VO2peak). VO2peak measurements require heavy aerobic exercise to near exhaustion which increases the potential for adverse cardiovascular events. This study tests the hypothesis that VO2 measured at a fixed submaximal workload of 30 W is a surrogate for VO2peak. We studied 42 normotensive African-American female university students, 18-25 years of age. We measured VO2peak, blood pressure, and VO2 at a 30 W exercise workload and computed BMI. We found significant negative correlations between BMI and VO2peak (r = -0.41, P < 0.01) and between BMI and VO2 at 30 W (r = -0.53, P < 0.001). Compared to VO2peak, VO2 at 30 W increased the significance of the negative correlation with BMI. The heart rate-systolic pressure product at 30 W was positively correlated with BMI (r = 0.36, P < 0.01) and negatively correlated with VO2peak (r = -0.38, P < 0.001). T...
Assessment of Exercise Intensity Formulas By Use of Ventilatory Threshold
Chest, 1988
Guidelines for training heart rate (HR) during aerobic exercise are often determined by predictive formulas. Measurement of the heart rate at ventilatory threshold (VT) by expired gas analysis provides a direct index of the upper limits of conditioning mtensity We evaluated 115 nonsmoking, healthy adults with measurement of peak oxygen uptake to classify groups as low-(0 = 45), average-(n = 45), and high (n = 25)-fitness, Heart rate at VT was compared with the approximate midpoint (77 percent) of recommended training intensity as estimated by the Karvonen equation, predicted maximal (220-age), and meas
European Journal of Applied Physiology, 2007
The purpose of this study was to compare, during a 30s intermittent exercise (IE), the effects of exercise intensity on time spent above 90% \({\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}} (t90\,{\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}})\) and time spent above 95% \({\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}} (t95\,{\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}})\) in young endurance trained athletes. We hypothesized that during a 30sIE, an increase in exercise intensity would allow an increase in \(t90\,{\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}}\;\hbox{and}\;t95\,{\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}}\) due to a decrease in time to achieve 90% or 95% of \({\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}}.\) Nine endurance-trained male adolescents took part in three field tests. After determination of their \({\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}}\) and maximal aerobic velocity (MAV), they performed, until exhaustion, two intermittent exercise sessions alternating 30s at 100% of MAV (IE100) or 110% of MAV (IE110) and 30s at 50% of MAV. Mean time to exhaustion (t lim) values obtained during IE100 were significantly longer than during IE110 (p \(\hbox{t}90{\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}}\;\hbox{or}\; \hbox{t}95 {\dot{\hbox{V}}\hbox{O}}_{{{\rm 2max}}}\) expressed in absolute or relative (%t lim) values between IE100 and IE110. In conclusion, an increased of 10% of exercise intensity during a 30s intermittent exercise model (with active recovery), does not seem to be the most efficient exercise to solicit oxygen uptake to its highest level in young endurance-trained athletes.
2005
The purpose of this study was to evaluate the sensitivity of the stair-climb test to predict changes in maximal oxygen uptake (VO 2 max) following ten weeks of aerobic training. Twenty-two men (mean age 37 10 years) and 22 women (mean age 35 11 years) participated in the study. All subjects performed a pre-training treadmill test (TM1) and stairclimb test (SCT1) to obtain their measured and predicted VO 2 max (MVO 2 max & PVO 2 max), respectively. Thereafter, they were randomized into the Exercise (E) and Control (C) groups. The training intervention for the E group consisted of thrice weekly 30-min sessions of aerobic exercises for ten weeks, with a target intensity ranging from 65 to 90% of maximum heart rate. The physical activity pattern of the C group remained unchanged throughout this period. Subsequently, all subjects performed a post-training treadmill test (TM2) and stair-climb test (SCT2). The difference between the changes in PVO 2 max and MVO 2 max following training ranged from 4.4 to 3.0 ml kg 1 min 1. The Pearson product moment correlation coefficients (0.62-0.82; P 0.01) and the Spearman rank correlation coefficients (0.55-0.87; P 0.01) showed a moderate and positive relationship between PVO 2 max and MVO 2 max for men and women, pre-and posttraining. In conclusion, the SCT (1) did not accurately track the changes in VO 2 max after ten weeks of aerobic training; (2) but could acceptably rank or categorize subjects' VO 2 max into broad fitness categories. The SCT serves as a simple and self-administered procedure to encourage sedentary individuals to engage in moderately intense aerobic exercise. We recommend that the SCT should not be used to precisely quantify or track small changes in cardio-respiratory fitness, but rather to create an interest in exercise by providing a broad estimate of aerobic fitness. It may also serve as a motivational tool to encourage individuals to use the stairs more often for exercise. sub-maximal, field test, maximal oxygen consumption